DB2 UDB for z/OS Version 8 Performance Topics - IBM Redbooks

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8-5 CF Request Batching - DB2 CPU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 324 8-6 Protocol Level 2 - Statistics Report extract . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 328 8-7 Protocol Level 2 - Accounting Report extract. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 328 8-8 Protocol Level 2 - RMF XCF Report extract . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 328 8-9 Protocol Level 2 - RMF CF Activity Report extract . . . . . . . . . . . . . . . . . . . . . . . . . 329 8-10 Protocol Level 2 - DB2 PE Statistics Report extract . . . . . . . . . . . . . . . . . . . . . . . . 330 8-11 Protocol Level 2 - RELEASE(DEALLOCATE) vs. RELEASE(COMMIT) . . . . . . . . . 330 8-12 DB2 I/O CI Limit Removal - Non-data sharing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 334 8-13 DB2 I/O CI limit removal - Data sharing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 334 8-14 DB2 I/O CI limit removal - Non-data sharing CPU . . . . . . . . . . . . . . . . . . . . . . . . . . 334 8-15 DB2 I/O CI limit removal - Data sharing CPU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 335 9-1 DB2 catalog growth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 344 9-2 Clist changes in the installation panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 351 9-3 Row counts for catalog tables - 698 MB catalog in V7 . . . . . . . . . . . . . . . . . . . . . . 355 9-4 CATMAINT statistics in non-data sharing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 356 9-5 Queries 5 and 18 rewritten for better performance . . . . . . . . . . . . . . . . . . . . . . . . . 359 9-6 Catalog consistency - Query 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 360 9-7 Catalog consistency - Query 33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 361 9-8 Catalog consistency - Queries 35 and 36 from SDSNSAMP. . . . . . . . . . . . . . . . . . 361 10-1 RECOVER and Archive Log Accelerator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 368 10-2 DB2 HPU vs. UNLOAD utility. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 371 10-3 HPU output formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 371 10-4 Unload test cases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 372 10-5 HPU V2.2 vs. DB2 V8 UNLOAD utility. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 372 10-6 HPU V2.2 vs. DB2 V8 DSNTIAUL (no multi-row) . . . . . . . . . . . . . . . . . . . . . . . . . . 375 10-7 HPU V2.2 vs. DB2 V8 DSNTIAUL (multi-row) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 376 A-1 DB2 V8 performance-related APARs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 378 A-2 DB2 V7 performance-related APARs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 386 A-3 z/OS DB2 performance-related APARs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 390 B-1 DBM1 AND MVS STORAGE BELOW 2 GB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 394 B-2 DBM1 STORAGE ABOVE 2 GB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 396 B-3 REAL AND AUXILIARY STORAGE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 397 D-1 PLAN_TABLE columns by release . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 409 D-2 PLAN_TABLE contents and brief history. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 410 D-3 EXPLAIN enhancements in DSN_STATEMNT_TABLE . . . . . . . . . . . . . . . . . . . . . 415 D-4 DSN_FUNCTION_TABLE extensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 416 D-5 Contents of DSN_STATEMNT_CACHE_TABLE. . . . . . . . . . . . . . . . . . . . . . . . . . . 419 xvi DB2 UDB for z/OS Version 8 Performance Topics
Examples 3-1 Insert 10 rows using host variable arrays for column values . . . . . . . . . . . . . . . . . . . 32 3-2 COBOL array declaration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 3-3 Define a table as MQT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 3-4 Alter a table to MQT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 3-5 Explain for Q662 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 3-6 SQL text for Visual Explain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 3-7 RUNSTATS statement provided by the Statistics Advisor. . . . . . . . . . . . . . . . . . . . . 73 3-8 Multiple table GROUP BY sort query. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 3-9 Multiple table ORDER BY sort query. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82 3-10 User-defined table function (1/3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84 3-11 User-defined table function (2/3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84 3-12 User-defined table function (3/3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84 3-13 Sample row trigger creation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86 3-14 Read program of static cursor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98 3-15 Read program of dynamic cursor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99 3-16 Update program of static cursor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 3-17 Update program of dynamic cursor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101 3-18 Multi-row FETCH program of a static scrollable cursor . . . . . . . . . . . . . . . . . . . . . . 103 3-19 Multi-row FETCH program of a dynamic scrollable cursor . . . . . . . . . . . . . . . . . . . 103 3-20 Multi-row FETCH program of a static scrollable cursor . . . . . . . . . . . . . . . . . . . . . . 104 3-21 Multi-row FETCH program of a dynamic scrollable cursor . . . . . . . . . . . . . . . . . . . 105 4-1 DBM1 Storage Statistics for a DB2 V7 subsystem . . . . . . . . . . . . . . . . . . . . . . . . . 158 4-2 DBM1 Storage Statistics for a DB2 Version 8 subsystem . . . . . . . . . . . . . . . . . . . . 163 4-3 DBM1 storage usage summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165 4-4 DB2 PE enhanced subsystem services reporting . . . . . . . . . . . . . . . . . . . . . . . . . . 205 4-5 Enhances deadlock trace record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206 4-6 DSNI031I - Lock escalation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208 4-7 IFCID 173 DSECT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210 6-1 Sample JCL of CHECK INDEX SHRLEVEL CHANGE . . . . . . . . . . . . . . . . . . . . . . 263 6-2 Sample LOAD statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 270 6-3 LOAD DATA text format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 271 6-4 LOAD DATA binary format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 271 6-5 UNLOAD DATA in EBCDIC format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 271 6-6 UNLOAD DATA in ASCII format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 271 6-7 RUNSTATS statement in V7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 276 6-8 DSTATS tool in V7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 276 6-9 RUNSTATS with distribution statistics in V8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 276 7-1 XML publishing example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 309 8-1 Sample -DISPLAY GROUP output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 327 9-1 DSNTIAUL with multi-row parameter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 349 C-1 SQL PA query description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400 C-2 SQL PA index information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400 C-3 SQL PA query analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 402 C-4 SQL PA predicate analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 405 D-1 Creating DSN_STATEMENT_CACHE_TABLE. . . . . . . . . . . . . . . . . . . . . . . . . . . . 418 © Copyright IBM Corp. 2005. All rights reserved. xvii
Page 1: ibm.com/redbooks Front cover DB2 UD
Page 4 and 5: Note: Before using this information
Page 6 and 7: 2.5.3 Increased number of deferred
Page 8 and 9: 4.5.2 Conclusion . . . . . . . . .
Page 10 and 11: 7.4.1 ODBC Unicode support . . . .
Page 12 and 13: x DB2 UDB for z/OS Version 8 Perfor
Page 14 and 15: 3-48 Consistency query - 31 New . .
Page 16 and 17: xiv DB2 UDB for z/OS Version 8 Perf
Page 20 and 21: xviii DB2 UDB for z/OS Version 8 Pe
Page 22 and 23: Trademarks The following terms are
Page 24 and 25: Added information The following APA
Page 26 and 27: ► Added reference to June 15, 200
Page 28 and 29: Michael Parbs is a DB2 Specialist w
Page 30 and 31: Hugh Smith Jim Teng John Tobler Yoi
Page 32 and 33: xxx DB2 UDB for z/OS Version 8 Perf
Page 34 and 35: 1.1 Overview 1.1.1 Architecture IBM
Page 36 and 37: - Column data type changes can be d
Page 38 and 39: 1.1.3 Data warehouse 1.1.4 Performa
Page 40 and 41: Volatile (or cluster) tables, used
Page 42 and 43: In this chapter we anticipate the a
Page 44 and 45: 2.1.3 I/O time 2.1.4 Virtual storag
Page 46 and 47: ► The performance benchmarks for
Page 48 and 49: application that can have great pot
Page 50 and 51: Because you can significantly incre
Page 52 and 53: The possible increase in thread foo
Page 54 and 55: 2.5.9 Unicode parser Important: Con
Page 56 and 57: You can keep the DBRMs in EBCDIC fo
Page 58 and 59: Macro Parameter Old value New value
Page 60 and 61: 28 DB2 UDB for z/OS Version 8 Perfo
Page 62 and 63: ► Parallel sort enhancement Paral
Page 64 and 65: Characteristics of the host variabl
Page 66 and 67: 3.1.4 Performance Update 10 rows us
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► Complexity of the fetch. The fi
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► More rows per one SQL statement
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3.2.1 Creating MQTs MQTs compared t
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Special register CURRENT REFRESH AG
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the materialized query table. If it
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Figure 3-9 MQTs and short running q
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► The elapsed time is 22 times sm
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Figure 3-13 Regrouping on MQT resul
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EVE.EXT = 'ADD BILL' AND EVE.TXC =
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Star Schema Figure 3-15 Star schema
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merge joins and work file usage. DB
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Star join access path without a spa
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3.3.4 Performance Sparse index for
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V8 Star Join Access Path Figure 3-2
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3.3.5 Conclusion Star join workload
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. SELECT * FROM PAOLO.TORDER WHERE
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But not all mismatched numeric type
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V8 shows that PL is joined with CV
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Query performance problem Lack of m
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3.5.1 Performance SORTDEVT SYSDA IN
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3.5.2 Conclusions Figure 3-31 Acces
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Mismatched data types SELECT COUNT(
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3.7.1 Performance In V8 the paralle
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3.7.2 Conclusions Example 3-9 Multi
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3.8.2 Performance We show three exa
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3.8.3 Conclusion The measurements s
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100 Inserts activated trigger 100 t
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3.10.2 Conclusion 100 Inserts activ
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stores the selected columns from ea
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While there is no optimistic lockin
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FETCH FROM Figure 3-45 FETCH syntax
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► Measurement data collected with
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application has decidedly higher Cl
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Static updatable cursor You can see
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Multi-row FETCH with a static curso
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3.12.5 Conclusion Multi-row FETCH a
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While, for or SELECT ... FROM ...
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3.14.2 Conclusion Percent reduction
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3.15.1 Installation commands. Of co
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Figure 3-47 Explain of the old cons
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in ms = 1 and the CPU cost is 16 se
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Figure 3-50 Suggested RUNSTATS stat
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Looking at the explanation, we can
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The Plug-In Options screen of Stati
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Before the introduction of MQTs, DB
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126 DB2 UDB for z/OS Version 8 Perf
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► Larger VSAM CI sizes: DB2 V8 in
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4.1.1 Performance support caused al
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Regression is about 5% better than
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The results indicate no significant
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Important: 4.1.2 Conclusion If you
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However, the combined impact of oth
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Frees up space below the bar for ot
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from the hiperpools, they were not
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So, we advise you to not overalloca
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See 4.3, “Monitoring DBM1 storage
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Table 4-4 System storage configurat
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Stack 11356 21033 85% 8648 19799 12
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KB 600 500 400 300 200 100 0 Figure
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For the same buffer pool size and o
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4.2.3 Conclusion Nondistributed per
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Important: With PTFs UK04394 (DB2 V
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- DATASPACE BP CONTROL BLOCKS = 0 M
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The EXTENDED REGION SIZE (MAX) is t
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RDS OP POOL (MB) N/A RID POOL (MB)
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As you can now appreciate, it is im
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Megabytes A V7 Customer DBM1 Thread
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4.5.1 Performance The most buffer p
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4.6.1 Performance maintained in a 2
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4.6.2 Conclusion We can conclude th
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service for Unicode conversions, an
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overcome this, when DB2 Connect is
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INSERT HV1 1200 HV2 1200 SELECT HV1
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AIX C-program Conversion Routines P
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4.7.1 Performance The improvements
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In October 2003, a new enhancement
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UseServerEncoding data source prope
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4.8.1 Performance 4.8.2 Conclusion
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Multilevel security with row-level
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► The security level that defines
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DB2 must call RACF for this dominan
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4.9.2 Conclusion The CPU increase c
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4.10.1 Performance VSAM does not kn
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4.10.2 Conclusion 4.10.3 Striping A
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5 4 3 2 1 0 9109TLLB 4 Parallel DB2
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--------------------------- -------
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This message is completed with the
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This enhancement is introduced by P
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This record is activated by: -START
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an online transaction with very sim
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5.1 System level point-in-time reco
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BACKUP SYSTEM During backup DB2 rec
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Figure 5-1 FRBACKUP PREPARE elapsed
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Figure 5-4 BACKUP SYSTEM FULL measu
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5.1.2 Conclusion The BACKUP SYSTEM
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Figure 5-7 shows the sliding scale
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Maybe you have implemented a space
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For dynamically prepared queries, D
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► CHAR(8) to VARCHAR(8) ► CHAR(
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Before ALTER INDEX add column, a ta
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30 25 20 15 10 Figure 5-12 FETCH CP
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Percent of index pages Avg. Index L
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300 250 200 time in seconds 150 100
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REORG REBALANCE We executed and mea
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5.4 Volatile table 5.4.1 Conclusion
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If explicit clustering for a table
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Load table of 20M rows, 10 partitio
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Times in seconds 20 18 16 14 12 10
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RUNSTATS INDEX PARTITION of a DPSI
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Note that when the qualified partit
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► “NO” - Values in such colum
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5.6.10 Support for more than 245 se
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6.1 Online CHECK INDEX Online CHECK
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SORTOUT DD UNIT=SYSDA,SPACE=(CYL,(5
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- SORT 6 indexes in parallel - CHEC
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make DB2 take the maximum paralleli
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6.3 LOAD and UNLOAD delimited input
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6.3.2 Conclusion We measured the CP
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Options for cardinality and distrib
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► Number of column groups: 1 ►
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cases is the total time of RUNSTATS
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6.4.5 Conclusion Statistics Advisor
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goals for end-user services. We sho
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alanced across all members. With th
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method. Prior to DB2 V8 those array
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when compared to DB2 V7. At the ser
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7.2.2 Performance - Distributed cli
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Recommendation If you currently do
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► The DB2 Universal JDBC type 4 D
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WebSphere z/OS - DB2 z/OS V8 - Serv
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DB2 Universal Type 4 Driver - JDBC
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Use DB2 Connect when a high amount
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JCC Type 4 Direct 4:3 Concentration
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The SYSIBM.INDOUBT table and the pa
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Batch updates A batched update is a
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Example In DB2 V8 SQL/XML publishin
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INSERT INTO PUB_TAB(DOC) SELECT XML
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7.5.3 Conclusion The new XML publis
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A second role of the managed server
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7.6.3 Performance The following inf
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Impact on coupling facility: You do
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Table 8-1 shows extracts from DB2 P
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and secondary GBP structures have t
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DB2 member already has the table sp
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8.2.1 Performance We ran a number o
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esolve any contention. This extra a
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There is also no need to use RELEAS
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Table 8-12 DB2 I/O CI Limit Removal
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8.5 Miscellaneous items In this sec
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DB2 V8 improves Restart Light. If i
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9.1 Unicode catalog DB2 for z/OS su
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that all applications are converted
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- CLASST: Specifies the threshold a
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From these measurements we observe
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Class 1 CPU time (MSEC) 200 150 100
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dynamic statement cache. If activat
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that everything is ready. This step
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Table Number of rows SYSDATABASE 75
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In Figure 9-7 we describe the perfo
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Old - Query 5 New - Query 5 CPU (se
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Query 35 36 Old DSNTESQ CPU 1 hr 1
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10.1 DB2 Estimator DB2 Estimator V8
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- REAL AND AUXILIARY STORAGE This i
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Another use is during back out of a
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In DB2, the IBM Data Encryption too
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The utilities ran on a G7 Turbo wit
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time Figure 10-1 DB2 HPU vs. UNLOAD
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DSNTIAUL with multi-row fetch The r
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A.1 Maintenance for DB2 V8 The APAR
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APAR # Area Text PTF and Notes PQ88
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APAR # Area Text PTF and Notes PK21
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B.1 DB2 PE Storage Statistics trace
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Storage heading Description 24 BIT
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C.1 DB2 SQL PA additional reports N
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|is the last matching predicate. Ap
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|ANL6052I *** NOTE: | |This index i
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PREDICATE ANALYSIS ----------------
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D.1 DB2 EXPLAIN EXPLAIN describes t
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Table D-2 PLAN_TABLE contents and b
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Column Type Content SORTC_ORDER BY
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Column Type Content OPTHINT CHAR(8)
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D.1.3 DSN_FUNCTION_TABLE You can us
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Example: D-1 Creating DSN_STATEMENT
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Column Type Content BIND_QUALIFIER
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ICF integrated catalog facility ICF
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► DB2 UDB for z/OS V8: Through th
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character set 174 CHECK DATA 262 CH
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Equi-join predicates 54, 402 Equiva
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MINSTOR 145-146 Mismatched data typ
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PQ84160 378, 387 PQ85764 387 PQ8584
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Sort tree nodes 144 SORTDATA 268 SO
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306 Universal Driver for SQLJ and J
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DB2 UDB for z/OS Version 8 Performa
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DB2 UDB for z/OS Version 8 Performance Topics - IBM Redbooks

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